Spectrum Sensing of OFDM Waveforms Using Embedded Pilots in the Presence of Impairments


Given the widespread deployment of orthogonal frequency-division multiplexing (OFDM)-based wireless systems, reliable spectrum sensing of OFDM waveforms is of great interest for future cognitive radio systems. Use of the embedded pilots of OFDM signals has been extensively studied in the literature. Such techniques rely on having correlated pilots to improve detection sensitivity. However, the impact of synchronization in accuracy and implementation impairments has not been thoroughly studied in the literature. This paper discusses the pilot-aided cyclostationary detection (PACSD) method as a practical structure to detect OFDM signals under asynchronous conditions. The presented analysis quantifies the performance of a detection method without exhaustive searching, compared with an ideal system. This paper goes on to investigate the impact of radio-frequency (RF) front-end nonidealities on the overall performance of the PACSD. We develop closed-form expressions for performance loss in the presence of in-phase/quadrature (I/Q) imbalance, carrier frequency offset, phase noise, and sampling clock frequency offset (SCFO). These results show that the most detrimental impairment is that of SCFO, where a 20-ppm offset can result in a 9-dB performance loss. We then present a modified detector structure to compensate for this huge loss. Analysis and simulation show that, using the modified technique, we can get within 2 dB of the ideal no-offset case.

Did you like this research project?

To get this research project Guidelines, Training and Code... Click Here

PROJECT TITLE :Structure-Aware Bayesian Compressive Sensing for Frequency-Hopping Spectrum Estimation With Missing Observations - 2018ABSTRACT:During this Project, we tend to address the matter of spectrum estimation of multiple
PROJECT TITLE :Optimal Hybrid Spectrum Sensing Under Control Channel Usage Constraint - 2018ABSTRACT:Cooperative spectrum sensing significantly improves the detection reliability of a cognitive radio network. In cooperative spectrum
PROJECT TITLE :Hybrid Analog–Digital Transmit Beamforming for Spectrum Sharing Backhaul Networks - 2018ABSTRACT:This Project deals with the problem of analog-digital transmit beamforming under spectrum sharing constraints for
PROJECT TITLE :Market Mechanisms for Dynamic Spectrum Access (DSA) - 2018ABSTRACT:This Project applies basic market-based approaches to the matter of (wireless) spectrum sharing between a licensed primary user (PU) and an unlicensed
PROJECT TITLE :D-FROST: Distributed Frequency Reuse-Based Opportunistic Spectrum Trading via Matching With Evolving Preferences - 2018ABSTRACT:Spectrum trading creates more accessing opportunities for secondary users (SUs), and

Ready to Complete Your Academic MTech Project Work In Affordable Price ?

Project Enquiry